You really need to ask the Theme Review Team. I review the reviews. ??
Here’s the important part of this topic. When plugin and theme authors ask for a review, that is very cool and I will never have a problem that.
But it needs to be dismissible. Author’s who make it dismissible get the user’s appreciation. No one likes the constant reminder because that is obtrusive and, more importantly, damages your user’s experience with your theme.
There are many acceptable ways to ask for reviews. Some plugin authors even have code that waits for an event and just ask for a review with “10,000 <EVENT HERE>! Awesome! Would you like to leave us a review? You can do so here <LINK>”
That works. That works amazingly well. I don’t have a problem with asking for reviews that way and neither should you. It gets more reviews because your users are thankful that you a) don’t bug them and b) actually like your theme.
That’s a better way to do it and achieves what you want, which is good community feedback.